Implements the behaviours of the Quaternion Class -- provides methods for quaternion transformation.

I've swayed from using '$' as a class-based variable identifier for this class due to the increased usage of UI-defined class variables for this group of classes: Point, Vector, Quaternion, Col, and ColMC classes all reflect this format.

usage:

var inst:Quaternion = new Quaternion(x,y,z,w)

parameters:

x (Number) -- x-axis component of quaternion.
y (Number) -- y-axis component of quaternion.
z (Number) -- z-axis component of quaternion.
w (Number) -- transform component of quaternion.